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Direct and General Support Preventive Maintenance Services
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TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
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Engine Overheats
Tighten all mounting bolts and loose or leaking hydraulic connections. Replace a
defective drive coupling (par. 153).
Hose assemblies. Inspect the hydraulic hose assemblies for loose connections. Inspect
the hose for cracks, breaks, and for frayed or rotten fabric covering.
Tighten hose connections and replace any defective hose assembly.
Tubing. Inspect all tubing for cracks, breaks, and distortion.
Tighten all tube connections. Replace any damaged or defective tube or fitting.
High pressure filter assembly. Inspect the filter for dirty or clogged condition resulting
in excessive pressure drop.
Remove and replace the filter element.
Thermoswitch.  Inspect the thermoswitch for correct temperature response and for
secure installation.
Replace a defective or damaged thermoswitch (par. 143).
Section ill. TROUBLESHOOTING
79. General
followed by a list of probable causes of
stated is
This section provides information useful in
the trouble. The possible remedy recommended
diagnosis and correction, inspection, operation,
is described opposite the probable cause.
o r failure of the hydraulic test stand, or any
of its components.  Each trouble symptom
80. Engine Hard to Start or Fails to Start
Probable cause
Possible remedy
Charge or replace defective battery (par. 9).
Battery defective. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspect the choke valve for full open or closed position
Choking insufficient. . . . . . . . . . . . . . . . . . . . . . . . . . .
Tighten loose connections.
Battery cables loose on terminals. . . . . . . . . . . . . . . . . . . . . .
Replace switch (par. 138).
Ignition switch faulty. . . . . . . . . . . . . . . . . . . . . . . .
Tighten loose connections.
Battery cable loose on armature relay. . . . . . . . . . . . . . . . . .
Remove spark plugs (par. 114) and crank the engine
Carburetor flooded. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
several times to drive out rich fuel mixture.
Test the spark (par. 115).
No ignition spark. . . . . . . . . . . . . . . . . . . . . . . . . . .
Clean and adjust or replace spark plugs (par. 114).
Spark plugs defective. . . . . . . . . . . . . . . . . . . . . .
Repair or replace magneto contact point set (par. 115).
Magneto faulty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
81. Engine Misses or Runs Erratically
Probable cause
Possible remedy
Tighten carburetor mounting bolts. Replace gasket if
Carburetor gasket leaks
leak persists (par. 122).
Test spark (par. 115)
Spark weak. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measure and reset spark plug gap (par. 11.4) .
Spark gap incorrect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tighten ignition wire connections.
Ignition wiring loose. . . . . . . . . . . . . . . . . . . .
Clean, adjust, or replace contact points (par. 115).
Magneto contact points pitted or incorrectly adjusted
Repair governor (par. 135).
Governor defective
82. Engine Stops Suddenly
Possible remedy
Probable cause
Repair or replace fuel pump (par. 131).
Fuel pump defective
Remove and clean fuel line, replace if defective (par.
F u e l line clogged
Replace defective contact set (par. 115) .
M a g n e t o contact set defective
AGO 5742A

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